1998 Chevrolet Venture Owner's Manual - Page 342

When you put thecap back on, turn it to the right (clockwise) until youhear a clicking sound. Make sure you fully install the cap. The diagnostic system can determine if the fuelcap has been left off or improperly installed. This would allow fuelto evaporate into the atmosphere. See "Malfunction Indicator Lamp'' L the Index. * . Fillinq a Portable Fuel Container I NOTICE: If you need a new cap, be sure to get the right type. Your dealer canget onefor you. If you get the wrong type,it may not fit properly. This may cause your malfunction indicator lamp to light and yourfuel tank andemissions system may be damaged. See "Malfunction Indicator Lamp" in the Index. Never fill a portable fuel containerwhile it is in your vehicle. Static electricitydischarge from the container can ignite the gasoline vapor. You can be badly burned and your vehicle damaged if this occurs. To help avoid injury toyou and others: Dispense gasoline only into approved containers. Do not fill a container while it is inside a vehicle, in a vehicle's trunk, pickupbed or on any surface other than the ground. Bring thefill nozzle in contact with the inside of the fill opening before operating the nozzle. Contact shouldbe maintained until thefilling is complete. Don't smoke while pumping gasoline. 6-7